Coremaking machine



May 30, 1944. c. H. sHAFFER CORE MAKING MACHINE Filed July 2l, 1941 7Sheets-Sheet 1 May 30, 1944 c. H. sHAFFER 2,350,253

('JORE MAKING MACHINE Filed July 21. 1941 '7 Sheets-Sheet 2 May 30,1944. c. H. sHAFFER 2,350,253

CORE MAKING MACHINE Filed July 21, 1941 '7 Sheets-Sheet 3 l 45 E Igmc/whom C. H. SHAFFER CORE MAKING- MACHINE Filed July 21, 1941 May 30,1944.

7 Sheets-Sheet 4 May 30, 1944-- c. H. sHAFFE 2,350,253

CORE MAKING MACHINE Filed July 21, 1941 7 Sheets-Sheet 5 May 30, 1944.c. H. sHAFFl-:R

' CORE MAKING MACHINE Filed July 21, 1941 7 Sheets-Sheet 6 l "i 1 .f

1 vu mfr/bo@ @H9255 H yaf-Ff/Q May 30, 1944- c. H. SHAFFER 2,350,253

CORE MAKING MACHINE Filed July 2l, 1941 7 Sheets-Sheet '7 Patenteid May30, 1944 UNITED STATES PATENT OFFICE/f COREMAKING MACHINE- Charles H.Shaffer, Lancaster, N. Y.

Application July 21, 1941, SerialNo. 403,418

9 Claims. A(Cl. 22--10) This invention pertains to a core making machineemployed in foundry practice for the formation of sand cores incident tothe manufacture of castings.

An object of the invention is the provision, in 2 a core making machineof the roll-over type, of a selectively operated means for raising andlowering a core box.

Another object of the invention is the provision, in a core makingmachine, of a core tion as a medium through which a core plate vcarrying completed cores is shifted or moved away from the machine so asto facilitate a renewal of the operation of making additional cores.

An added feature of the invention is the provision, in a core makingmachine, of adjustable stop means for maintaining a parallelrelationship between a core plate and a conveyer therefor.

A still further object of the invention is the provision, in a coremaking machine, of a fluid pressure responsive actuating means adaptedto raise and lower a core box through the medium of vertically movablemeans with the actuating means flexibly and adjustably connected to thevertically movable means.

The above as well as numerous other objects of the invention will becomeapparent from the accompanying drawings which, in several views,disclose an exemplified form of the invention and wherein;

Figure l is a iront elevational View of a core making machine embodyinga form of the invention and illustrating the relative position of partspreparatory to introducing sand in a core box.

Figure 2 is a front elevational view of a core making machine similar tothat illustrated in Figure l except that the relationship of partsthereof is shown after the cores have been made.

Figure 3 is a side elevational View of the machine illustrated in Figurel.

Figure 4 is a side elevational View of the machine shown in Figure 2. i

Figure 5 is a side elevational View of the males chine shown in Figure 2illustrating the opposite side of the machine shown in Figures.

Figure 6 is a' plan -View of the machine shown in Figure l. A

Figure 'l is a vertical cross sectional View taken along the lines l-lof Figure l, looking inthe directionof the arrows. V

Figure 8 is' a horizontal :sectional view-taken along the .lines 3 8 ofFigure Y3, looking in the direction of the arrows.

Figure 9 is a vertical sectional View takenzalong the .lines 9-9 rofFigure 6, looking in the direction of the'arrows. v j f Referring now indetailto the drawings wherein like reference charactersindicate likeparts, the numeral l designates generally a core making Amachine havinga skeletonized frame or superstructure .2 formed by transversely spaced,horizontal, longitudinally .extending lower beams 3 secured totransversely and longitudinally spaced vertically extending .uprightVposts or standards t which bear upon :a foundation or oor 5. Positioneda predetermined ,distance above the lower beams are transversely. spacedintermediate beams B of vchannel form in vcross section which aredesirably parallel'to the lower beams and secured to the posts by anypreferred method, such as by welding (not shown). The posts or standardsare reinforced against a spreading action thereof which may be caused bya superimposed load by upper and lower spaced parallel cross bearers jl'anda, respectively, Aconnecting aligned pairs -of posts;

Bearing upon or carried by the top cross Ibearer is a hopper orcontainer 9 formed by front and rear walls l0 and Ill.a joined yby side-dening walls l i and a base plate -I 2 to, present a receptacle for asupply of 'sand' used inthe manufacture of cores. The front Wall It hasAan elongated aperture I3 adjacent its juncture with the base plate sothat an loperator may scoop the sand from the lower extremity of thehopper. The base plate is extended a slight distance beyond the verticalplane or limits of the front -wall longitudinally of the'machine towardone extremity thereof, as at-M, so as to `form a ledge for the supportor accommodation of the sand Within the container, llillounted upon thehopper and adequately securedl thereto is a -chute l5 communicating-withthe .hopper to forma means for carrying the sand ,from a deliveryconveyer (not shown) or any other instrumentality employed. Extendingparallel `and co-extensive with the intermediate beams are transverselyspaced upper or topbeams' IG which are 'supported intermediate theirends by diagonal braces I1 forming substantial continuations of some ofthe posts 4 and which may be welded or otherwise secured to the top andintermediate beams I6 and 6, respectively. Transverse or cross ties I8extend between the top beams and are secured to the diagonal braces torigidify the upper limits of the skeletonized frame and maintain the topbeams in a predetermined spaced relation. c L

Adjacent the extremities of the top and intermediate beams, removed fromthe hopper and chute, are arranged pairs of laterally spaced inner andouter guide plates or track bars I9 and I9 having suitably disposedtapped apertures 2U. The apertures in the guide plates I9 are inalignment with holes 20"l formed in the top and intermediate beams forthe accommodation of bolts 2| which bind the inner track bars to theframe. The tapped apertures in the guide plates I9a are in substantialalignment with elongated horizontally disposed slots 20b in the upperand intermediate'beams for the vreception of bolts 2la binding the outertrack bars to their related beams. As will be noted by referring toFigures 4 and '1 of the drawings, the bolts 2la may be loosened tofacilitate adjusting the outer guide platesand thereby compensate forwear which will be created therein as a result of continued use. Also,by reason of the elongated slots,

vguide plates of a pair may be arranged in parallel relation. Relatedguide plates are provided with depressions, grooves, or V-shapedguideways 22 facing one another and extending vertically of the machine.Mated with each pair or set of guide plates I3 and I9 is a guide,elevator or carriage 23 having V-shaped sides 24 fitted into or nestingwith the guideways of the plates to form an interlock between theelevators and the track bars as Well as direct the carrier along a.

given vertical path. The carriers, spaced transversely of the machine,have adjacent their lower extremities, bearings 25 located on thevertical axis of the carriers.

Extending between the elevators is a cradle 26 comprisingseparated endhangers 21 which are inverted V-shaped in elevation when viewed from theside and are joined adjacent their lower extremities by laterallyextending horizontal I-shaped sills 28 secured to the hangers by meansof Welds (not shown) or any other desired method. The hangers haveapertures 29 adjacent their extremities which may be termed upper orremoved from the sills for the accommodation of pivot pins or trunnions30 outstanding from the hangers and journaled in the bearings so as tofacilitate a rotative movement of the cradle thereabout. The cradledirectly supports risers 3I secured thereto by any preferred methodwhich, in turn, function as supports for a core box 32. The risers maybe made of various heights since it is their oiiice to place the uppersurface of the core box in substantially the same horizontal plane asthe hopper base plate, and accordingly the depth of the core boxemployed is determinative of the height of the risers. Pivotallyattached to the free or core box adjacent extremity of the base plate isan apron 33 adapted to bridge or span the distance between the hopperbase plate and the core box and thereby permit sand to be scooped by anoperator from the hopper opening I3 to the core box. When the core boxhas been properly lled and tapped or rammed with sand the apron 33 ispivoted up- `34 are pivotally secured to the hopper front wall I0 andare arranged to engage the free extremity of the apron to retain thelatter in elevated position or out of supported contact with the corebox when it is not the desire of the operator to obtain sand from thehopper.

The core box is provided with a detachable or removable cover or coreplate 35 which is placed thereon after the sand has been packed orrammed into the core box cavities 32a preparatory to rolling theassembly over. Forming a direct auxiliary support for the cradle in oneinstance while the cores are being made or, at another time, a supportfor the core plate after the completion of the core making operation isa roller means or conveyer 36 bearing upon the lower beams 3 andextending transversely or laterally of the machine so that when the corebox has been elevated from the core plate and completed cores the lattertwo may be shifted transversely of the machine out of the Way of theoperator to facilitate a repetition of the operation of formingadditional cores.

In rolling the assemblage over preparatory to disengaging the core platefrom the core box care should be exercised so that the core plate willbe in a horizontal plane parallel to the plane presented by the tops ofthe rollers of the conveyer so that when the core plate holding means isreleased it will be completely supported by the conveyer as otherwise asudden drop of any portion of the core plate will result in damage tothe cores formed in the box. To eliminate any element of chance in nothaving the core plate,

. before being released from the core box, come standing from the outerlower extremity of the yoke adjacent the arm 31 is a stop, lug orlimiting means 40 arranged so that upon a, roll-over action of theassemblage the stop 4I] will engage the bolt 38 and thereby assure aparallel relationship between the core plate and supporting surfaces ofthe conveyer. As will be noted, the bolt 38 may be manipulated oradjusted vertically to ensure the proper relationship between the coreplate and conveyer.

Means has been associated with the elevators or carriers to raise thecradle and core box assemblage from its lowermost position or as thatillustrated in Figure l, and for this purpose there has been provided aplurality of stanchions 4I, preferably two in number and each upstandingfrom the respective top beams in the proximity of the guide plates. Thestanchions have, associated with their upper extremities, a plurality ofbearings 43 which are connected to or house extremities of atransversely and horizontally disposed idler shaft or axle 44. The axlehas keyed or otherwise secured thereto, intermediate its ends and inproximity to the bearings, a plurality of, preferably two, sprockets 45each of which is in substantial vertical alignment with a subjacentassociated carrier. Joining the and the cylinders. operating handle 6lso as to project toward the -means or a hoist cylinder 41 having areciprocating plunger 48 projecting from one or an upper extremitythereof and provided with laterally spaced ears 49 at or adjacent itsother or lower extremity which are secured tothe bracket through boltsor pins 50, thereby pivotally attaching the hoist cylinders to the frameso that the plungers may, at all times, movealong yor through anunrestricted path longitudinally of the cylinder. Attached to the outeror free extremity of each plunger is a flexible means or roller chainwhich is threaded or trailed over and intermeshed with an alignedsprocket lto depend therefrom and be secured to an associated carrier.Each carrier has, adjacent its upper extremity, a shoulder or lip 52outstanding from the carrier inwardly of the machine and provided with alvertically disposed aperture which accommodates an adjustable meanscharacterized by the illustrated yoke 53. The yoke is the medium throughwhich each roller chain is secured to a related carrier, and by reasonof this connection adjustments may be made to the yoke to change oralter the effective length thereof so that the cradle may support thecore box in a true horizontal disposition as well as causeboth carriersto move in a selected direction vsimultaneously.

Fluid pressure means has been associated with the cylinders so as toactuate the plungers thereof in effecting a raising or lowering actionof the cradle and core box assemblage, and as exemplary of such a` meansatop or upper beam, preferably the one to the right facing the machineas in Figure l, has aflixed thereto, adjacent its extremity removed fromthe hopper, a hoist cylinder operating valve 54 having a fiuid pressuresupply line 55 communicating therewith. The fluid pressure line isassociated with a source of supply (not shown) which may contain anymedium for the transmission of force,y such as water, air or any likesubstance. Extending in the same general direction as the top beam awayfrom the cylinder valve are a plurality of, preferably two, cylinderconduits 5B and 5ta, vertically disposed relative to one another, theformer of which is connected to the upper extremity of the cylinder onthe same side of the machine as viewed in Figure 1 and through aiiexible coupling 5l, while the latter conduit 55a is connected to thelower extremity of the same 'cylinder through a iiexible coupling 51a.interposed in each cylinder conduit 56 and 56a is a T-coupling 58 whichhas, leading therefrom through both-of "the top beams, cylinder upperand lower branch pipes 59 and 5?a leading from the cylinder conduits 56and 56a, respectively. The upper and -lower branch pipes terminate inflexible hoses 60 and Sta, respectively, to have the hose 60 connectedto the upper extremity of the cylinder at the left-hand side of themachine and the hose 68a connected tothe lower extremity of the samecylinder. The couplings 51 and 5la and the hoses 88 and 6ta are made ofa flexible material so as `to compensate for any service movements ofthe vcylinders and prevent a leak in or escape of iiuid pressure fromthe lines joining the cylinder valve The cylinder valve has" an front ofthe machine and be within easy grasp of an operator. The valve is soarranged that if the handle 6l is moved from the illustrated horizontalor normalposition downwardly in a counterclockwise direction, asindicated diagrammatically at Gld, iiuid pressure is permitted to passthrough the couplings 5la and thehosesllla to the cylinders beneath theplungers and cause the plungers to move outwardly of the cylinders. Thisaction of the plungers will result in a lowering action of the cradleand core box. A movement of the operators handle in a clockwisedirection to a position as indicated diagrammatically at Bla will resultin uid pressure entering the upper limits of the cylinder to force theplungers inwardly of the cylinders and cause the cradle and core box tobe raised away from the 65 positioned intermediate the vertical limitsof the aperture so that when the operating handle is moved fromhorizontal or normal position, as illustrated by full lines particularlyin Figure 3, in either direction to engage one of the shoulders, only alimited or restricted amount of fluid pressure is permitted to pass'through the valve and enter the cylinders, and therefore the plungerswill move slowly in response and in a direction corresponding to theflow of liu-id. AThis arrangement is provided in the machine so thatwhen the handle is raised or moved to a position indicateddiagrammatically as at 6ta fluid pressure is permitted to enter theupper limits of the cylinder to urge the plungers inwardly of thecylinders at a comparatively rapid speed. This plunger action willresult in the cradle and core box assemblage being raised from theposition illustrated in Figure 1 until the assemblage reaches itsuppermost limit of travel. At this time the operator will roll theassemblage over so that the core plate will be facing downwardly. Theoperating handle is then moved downwardly to a position as indicateddiagrammatically at vlf to engage the shoulder 65, resulting in thefluid pressure being cut off from the upper limits of the cylinder to beby-passed to the lower limits the core plate comes to rest on thetransverse conveyer at which time the core plate is disengaged from thecore box and the operating handie is moved to a position as indicateddiagrammatically at lc to engage the shoulder 54. This lever action willcause a reversal of the flow of fluid pressure to the cylinders, againmoving the plungers inwardly of the cylinders and the assemblageupwardly away from the core plate.

This latter movement will be at a reduced speed vso as not to causedamage to the cores upon the withdrawing action of the core box. As soonas the cores have broken away from the core box, or shortly thereafter,the operating lever is again raised to the position indicated at iiia tomove the assemblage at a greater rate of speed and decrease the timeconsumed for a single core making operation. Upon reaching the uppermostlimits of its range of movement the assemblage is again rolled over toposition the cradle lowermost in the assemblage, and the 'operating whenconsidering the disclosure of Figure 1.

63, as indicated diagrammatically at 61d. 'Iv'his lever action will`cause a full or unrestricted flow of fluid pressure to the lowerreaches of the cylinders and a maximum speed drop in the assemblage toagain place the cradle in bearing relation with the conveyer to renewthe operation of forming additional cores.

As heretofore indicated, the core plate is removably secured to the corebox so as to hold it in assembled relation therewith during the rolloveroperation and permit the core plate to be disengaged from the core boxafter the plate is placed in bearing relation with the conveyer.

-Consideration has been given toforming the core plate securing means soas to be selectively operated and thereby diminish the time consumed fora complete operation of forming a core orA set of cores. Toward theaccomplishment of this end the securing means of the present structurecomprises a supporting bar 66 secured to the cradle sills to extendtransversely of the cradle adjacent each extremity of the core box.

Each supporting bar has aflixed thereto intermediate its ends a coreplate clamp 61 including ,A

a barrel or cylinder 68 having, projecting outwardly and upwardly orvertically therefrom, a piston 68a. Mounted upon each barrel is a rollerguide 69 having an angularly disposed raceway `1l! for the accommodationof a contained anti-y friction element or roller means 1l positionedimmediately above the outer or upper extremity of the piston. Forming apart of each clamp is a fork 12 having the lower end thereof bifurcatedto accommodate the outer extremity of the piston and being pivotallysecured to the piston extremity so as to be capable of movementtherewith. The anti-friction elementcf each clamp is pivotally securedto and adapted to be retained in the raceway by the associated fork.

The fork of each clamp has, extending toward and in overlying relationwith the related extremity of the core plate, a plurality of, preferablytwo, tines 13 provided with thread defining apertures for theaccommodation of adjustable elements or screws 14 which are: adapted tocontact the core plate and retain the latter in assembled relation withthe core box. Each screw 14 may be manipulated until a `predeterminedlength thereof is exposed beneath its related tine, and a lock nut 15,rotatably associated with each screw and superimposed upon and ingripping relation with each tine, sets or locks the screws in thisposition.

For the purpose of actuating the core plate clamps there is provided aclamp valve 15 anchored through a pendant projecting downwardly from thevalve to the frame of the machine in lower spaced relation to the hoistcylinder valve or on the right-hand side of the machine The clamp valveis fed through a nipple 16El communicating with the supply pipe 55.Connected to suitable ports inthe lower portion of the clamp valve is apair of upper and lower ducts 11 and 1111, respectively, which continuealong, in spaced relation, above the intermediate beam to projectangularly short of the hopper through a support -tube 19a also branchedbut communicating with the lower reaches of both clamp barrels.Aconhandle is then moved to the bottom of the slot -trol or handle isassociated with the clamp valve for a manipulation of the valve topermit fluid pressure to enter either the duct 11 or 11B.

From the above, therefore, it will be noted that when the control orhandle 80 is positioned as illustrated in full lines in Figure 6 orneutral, both ducts are cut off from the supply pipe. If it is desiredto hold the core plate in assembled relation with the core box thecontrol is moved from normal position to that as indicateddiagrammatically at 80a, at which time duid pressure is permitted toenter the upper duct 11 and reach the upper limits of the two clampbarrels to urge the pistons 68 inwardly of the barrels. This pistonmovement, as will be noted by referring to Figure 1, will urge the forksin a corresponding direction placing the roller elements 1l at the lowerlimits of the raceway 10 and the adjustable elements 14 in contact withthe core plate. After the assemblage has been rolled over and the coreplategis placedrin bearing relation with the conveyer, a movement of thecontrol to a position as indicated diagrammatically at 8l)b will cause ableeding action of the duct 11, permitting the fluid pressure therein toby-pass through the valve 16 to the ducts and enter the ducts 11B so asto reach the clamp barrels below the pistons and force the latter in anoutward direction. Such a piston movement will result in theanti-.friction elements 1| traveling along the angular portions of theraceways to the upper reaches thereof and thereby cause a compoundmovement of the forks or tines thereof carrying the adjustable elementsout of contact with the core plate to permit a separating action of thecore box and core plate.

Since there is a certain degree of adhesion between the core formingsand and the core box,

vvibratory means has` been provided in the machine to break the core orcores away from the core box. Accordingly, leading from andcommunicating with the main supply line is an auxiliary valve 8lprovided with a manipulating means or handle 82 and having, continuingtherefrom, a pipe 83 which extends substantially parallel to the ducts11 and 11a to extend angularly through the support plate and continuetherefrom as a flexible connection 84. The flexibleconnectioncommunicates with a vibratory means 85 which is anchored to either thesills of the cradle or, as preferred, to the core box on the sidethereof adjacent the cradle. When the assemblagev has been raised androlled over preparatory to lowering the assemblage for the purpose ofdisengaging the core plate from the core box the manipulating means isactuated so as to permit the flow of fluid pressure through theauxiliary valve 8| to thereby ultimately enter the vflexible connectionand set the vibratory means in motion. While the assemblage is beinglowered vibratory forces are set up in the core box tending to break thesand away from the core box so that after the core plate is disengagedfrom the core box the latter may be withdrawn,

leaving the core or cores deposited on the core plate and diminishingthe possibility of breaking or injuring the cores.

A feed pipe 8B in direct communication with the main supply line extendslongitudinally of the machine over the top beam to a position short ofthe hopper Where it turns upwardly across the top beam and inwardlytoward the intermediate portion of the machine, as at B1. The feed pipeterminates inA a stop valve 88 which has, leading therefrom, a flexibleconduit or hose 88 connected to a hammer or ram (not shown). When sandis being packed into the cavities of the core box an operator employsthe ram to ensure a tight compact mass of sand properly lling thecavities of the core box.

From the above it will be noted that various changes and alterations maybe made to the illustrated and described construction without departingfrom within the spirit of the invention and the scope of the appendedclaims.

I claim:

1. In a core making machine, a frame, transversely spaced verticallyextending guide means adjustably secured to said frame, sliding meansassociated with said guide means, a cradle pivotally connected to saidsliding means, fluid actuated means associated with said frame andadjustably connected to each of said sliding means for moving the lattervertically, a core box including a cover plate secured to said cradle,and fluid actuated clamping means attached to said cradle and adapted toengage said cover plate.

2. In a core making machine, a frame, transversely spaced verticallyextending guide means secured to said frame, a movable means associatedwith each of said guide means, a cradle extending between and pivotallysecured to said movable means, fluid actuating means associated withsaid frame and flexibly connected to said movable means for moving thelatter vertically, a sand hopper carried by said frame, a core boxincluding a cover plate secured to said cradle and positioned in a planebelow said hopper, an

apron pivotally mounted on said hopper adapted to span the distancebetween said hopper and core box, and selectively controlled meansattached to said cradle for clamping said cover plate to said core box.

3. In a core making machine, a frame, transversely spaced verticallyextending guide means secured to said frame, a movable means associatedwith each of said guide means, a cradle extending between and pivotallysecured to said movable means, uid actuating means associated with saidframe and flexibly connected to said movable means for moving the lattervertically, a sand hopper carried by said frame, a core box including acover plate secured to said cradle and positioned in a plane below saidhopper, an apron pivotally mounted on said hopper adapted to span thedistance between said hopper and core box, selectively controlled meansattached to said cradle for clamping said cover plate to said core box,and conveyer means extending transversely of said frame forming asupport for said cradle or cover plate.

4. In a core making machine, a frame, transversely spaced grooved guidemeans adjustably secured to said frame, vertically movable meansextending between and into said grooves, means pivotally secured to saidframe for raising said vertically movable means, a cradle extendingbetween and pivotally secured to said movable means, a core boxincluding a cover plate carried by said cradle, cover plate clampingrmeans secured to said cradle, and control means for actuating saidclamping means into and out of contact with said cover plate.

5. In a core making machine, a frame, grooved guide means secured tosaid frame, vertically movable means slidable in the grooves of saidguide means, a rotatable cradle pivotally secured to said movable means,cylinders pivotally secured to said frame, flexible means connectingsaid cylinders and movable means, a core box having a cover plateassociated with said cradle, clamping means secured to said cradle andadapted to be selectively manipulated to engage said cover plate, andmeans for operating said cylinders to raise or lower said movable means.

6. In a core making machine, a frame, guide means secured to said frame,vertically movable means in slidable relation to said guide means, anidling axle positioned above said movable means and journaled to saidframe, rotatable means pivotally secured to said movable means,

a core box mounted on said rotatable means,

fluid responsive actuating means pivotally anchored to said frame, andflexible means passing over said idling axle and connecting saidactuating means and movable means.

7. In a core making machine, a frame, guide means secured to said frame,vertically movable means in slidable relation to said guide means, anidling axle positioned above said movable means and journaled to saidframe, rotatable means pivotally secured to said movable means, a corebox having a cover plate mounted on said rotatable means, fluidresponsive actuating means anchored to said frame, and exible meanspassing over said idling axle and connecting said actuating means andmovable means, and a conveyer extending transversely of said frameforming a support for said rotatable means or cover plate.

8. In a core making machine, a frame, transversely spaced guide meanssecured to said frame, transversely spaced vertically movable meansslidably engaging said guide means, selectively controlled fluidactuated means pivotally connected to said frame and connected to saidvertically movable means for raising and lowering the latter, rotatablemeans extending transversely of said frame and being pivotally connectedto said movable means, a core box anchored to said rotatable means andhaving a cover plate, and selectively controlled fluid actuated meanscarried by said rotatable means and being adapted to clamp said coverplate to said core box.

9. In a core making machine, a frame, transversely spaced guide meanssecured to said frame, transversely spaced vertically movable meansslidably engaging said guide means, selectively controlled fluidactuated means connected to said vertically movable means for raisingand lowering the latter, adjusting means in said fluid actuated meansfor determining the relative vertical position of said verticallymovable means, rotatable means extending transversely of vsaid frame andbeing pivotally connected to said movable means, a core box anchored tosaid rotatable means and having a cover plate, selectively controllednuid actuated means carried by said rotatable means and being adapted toclamp said cover plate to said core box, and a conveyer extendingtransversely of said frame in lower spaced relation to said verticallymovable means for supporting said rotatable means or cover plate.

CHARLES H. SHAFFER.

